/Engine/Source/Editor/UnrealEd/Public/LevelEditorDragDropHandler.h
virtual bool PreviewDropObjectsAtCoordinates ( int32 MouseX, int32 MouseY, [UWorld](API\Runtime\Engine\Engine\UWorld) * World, [FViewport](API\Runtime\Engine\FViewport) * Viewport, const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetData )